Questions tagged [error]
The error tag has no usage guidance.
175
questions
1
vote
1answer
21 views
truffle unbox pet-shop gives DownloadingError: read ECONNRESET at TLSWrap.onStreamRead (internal/stream_base_commons.js:201:27)
Ubuntu 18.04.
Truffle v5.1.2 (core: 5.1.2)
Solidity v0.5.12 (solc-js)
Node v13.2.0
Web3.js v1.2.2
When I execute truffle unbox pet-shop on terminal, I get error
✔ Preparing to download
⠼ ...
-1
votes
0answers
9 views
Warning! Error encountered during contract execution [Reverted] in Vesting Contract [closed]
I created a vesting contract it is same with maticvestingcontract https://etherscan.io/address/0xcbfe11b78c2e6cb25c6eda2c6ff46cd4755c8fca#code
when what should ı do for withdraw from vesting contract. ...
2
votes
1answer
23 views
Solidity. Find whether a key exists in a mapping. Then get its value
I have a simple mapping:
mapping(address => string) professorsExam;
How can I check if msg.sender is a key in this mapping, and if it is, get its value? If it isn't I should return something.
...
1
vote
1answer
72 views
Issue with selfdestruct() getting an error
main contract function which calls my secondary contract
function gameOver(uint _matchId)public payable onlyOwner returns(bool) {
Match my_match = Match(matchTracker[_matchId]);
bool success ...
0
votes
1answer
16 views
invalid implicit conversion from contract to address requested contract
I am using this function to create a new contract instance of Match contract which takes 4 parameters.
However i am getting this error message "invalid implicit conversion from contract to address ...
0
votes
0answers
13 views
Assertion error running truffle test
I cant seem to understand where this error comes from. Maybe someone can help
My token solidity file :
pragma solidity >=0.4.2 <0.6.0;
contract LairToken {
//Name
string public name = "Lair ...
0
votes
0answers
31 views
Error: Returned values aren't valid, did it run Out of Gas based on YT Tutorial
I red the other Threads about this case, but couldn't fixed the problem.
I got this tutorial for Scmart contracts:
https://www.youtube.com/watch?v=coQ5dg8wM2o&feature=youtu.be
However the ...
1
vote
0answers
19 views
0
votes
0answers
19 views
How can MetaMask alert about transaction errors before they are caused?
The MetaMask extension has this feature to warn about transaction errors before a transaction is being made:
ALERT: Transaction Error. Exception thrown in contract code.
How is this done? A dry ...
0
votes
0answers
11 views
Geth error: Genesis not found in chain - error on the worker node!
Good afternoon. After restarting the server when trying to run get I get an error. Start command:
geth --rpc --rpcport 8545 --rpccorsdomain "*" --rpcapi "db,eth,net,web3,personal" --cache 8192 --...
0
votes
1answer
29 views
rpc error with payload and exception thrown in contract code
This is the problem I get when trying to run my contract!
And then when I go ahead and run it, this pops up
This is my js code:
import React, { Component } from 'react';
import Web3 from 'web3';
...
0
votes
2answers
126 views
Remix Deploy Error encoding arguments
I'm building a simple fund raising smart contract and having problems deploying this through Remix. I'm wanting to set the "goal" and "minimum contribution" values (in wei) during the contract ...
-3
votes
2answers
57 views
Trying to create an instance of an abstract contract
pragma solidity ^0.5.0;
import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol';
contract SubToken{
mapping(address => uint) balances;
...
2
votes
1answer
66 views
How does one retrieve revert/require error messages from RPC
In both of these questions, the user is asking if it's possible to get the error string from a revert or require. The answers say, basically, "Yes" and point to Truffle or other methods.
VM Exception ...
0
votes
1answer
61 views
create ERC-20 token from a contract function
I would like to do a function create contract with ERC-20 interface.
But I have a few problems.
If anyone help me I’ll be appreciated.
Here’s the code :
pragma solidity ^0.5.0;
import 'https://...
0
votes
1answer
37 views
create contract from function / contract
**Hey guys !
I just try to make a contract for create a contract.
It supposed to be ERC-20 interface so my first contract for this.
But I don’t know how can I do _mint and createContract functions
...
0
votes
1answer
26 views
Expected identifier but got reserved keyword 'reference' Product public reference; ^-------^ [closed]
hello guys I am a beginner.
I would like to make a function for create a contract.
I found a example on the internet but gives me an error so I dont know what should I do.
Anyone can help me ?
...
1
vote
2answers
57 views
Error: gas required exceeds allowance or always failing transaction in Remix using Ropsten network
I am facing this error
, My Contract is quite simple
pragma solidity ^0.5.0;
contract sendEther {
address payable sender;
function showReceiver() public view returns (address payable) {
...
0
votes
2answers
16 views
it'll give me a parser error
pragma solidity ^0.5.0;
contract fisrtCoin {
address deployer;
mapping(address=>uint) balances;
public function fisrtcoin() {
deployer = msg.sender;
}
public ...
0
votes
1answer
106 views
'types/values length mismatch',
Hey guys I had a problem with my return function
here's my smart contract :
pragma solidity >=0.4.0 <0.7.0;
contract NewHello{
address owner;
address newOwner;
constructor()public{
...
1
vote
1answer
155 views
Function declared as view, but this expression (potentially) modifies the state requires payable
I'm trying to change the an address data variable to a one, which is selected via a function.
Keep getting the below error.
Function declared as view, but this expression (potentially) modifies the ...
0
votes
3answers
223 views
ParserError: Expected ',' but got identifier
pragma solidity >=0.4.0 <0.7.0;
contract NewHello{
struct kullanicilar{
string name;
string surname;
uint age;
}
event infoChanged(
string name,
...
0
votes
0answers
191 views
Etherscan says “we were unable to locate a matching bytecode (err_code_2)”
Please help me with this error...
I dont know what is it?
0
votes
1answer
208 views
Transaction Error. Exception thrown in contract code. (MetaMask)
When I use Ganache it runs with no problem and MetaMask too. When I run my contract in my private Ethereum network (Geth). When I use a function from my contract the MetaMask gives me this error (...
0
votes
0answers
28 views
Get the address of a contract without using Remix-ide
I'm studying Ethereum, I need to get the contract address for interact with web3, I can not use Remix-IDE for this since that I installed Kali as an operating system. How I get the contract address ...
2
votes
2answers
200 views
Syntax Error: Type tuple(bool,bytes memory) is not implicitly convertible to expected type bool
I am trying to compile the following program:
pragma solidity ^0.5.1;
contract MKotET1_1{
address payable king; uint public claimPrice = 100;
function calculateCompensation() public ...
1
vote
1answer
23 views
call: Warning: Unused local variable
I am trying to compile the following code:
pragma solidity ^0.5.1;
contract MKotET1_1{
address payable king; uint public claimPrice = 100;
function calculateCompensation() public returns(uint)...
2
votes
1answer
22 views
I have a ParserError here “function Stratus(string _greeting) {”
pragma solidity ^0.4.19;
contract Stratus {
string public greeting;
address public owner;
event GreetingChanged (string oldGreeting, string newGreeting)
function Stratus(string ...
0
votes
2answers
121 views
Type uint256 is not implicitly convertible to expected type int256
I'm trying to compile the following keep getting an error, even though used this before in second code and its working fine.
Simply trying to change the temp to the new temperature set by the user, so ...
0
votes
1answer
253 views
MetaMask - RPC Error: Error: WalletMiddleware - Invalid “from” address
I'm trying to create a simple Dapp (via tutorial) which would allow me to send Ether from sender to receiver (via a contract with an address that automatically approves the transaction). The truffle ...
1
vote
0answers
19 views
How to process null TransactionReceipt?
I have some transaction that is sent and from time to time when I call the eth_getTransactionReceipt I get a null.
I see esentially two approaches for handling this:
I could reiterate the call to ...
0
votes
1answer
581 views
TRUFFE MIGRATE: Saving migration to chain.Error: Error: Error: Returned error: VM Exception while processing transaction: invalid opcode
$ truffle migrate
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
Starting migrations...
======================
> Network name: ...
1
vote
0answers
53 views
Using web3j with infura returns null
I've used web3.js to handle my contracts, and it worked very well.
But web3j is pretty hard for me since the beginning.
I'm using android studio, infura, web3j.
Since I don't know very much about ...
0
votes
0answers
24 views
DeclarationError: Undeclared Identifier. Did you mean “_data”? data = _data ^__^. All i want is to create a cryptocurrency
pragma solidity ^0.5.1;
contract owner {
address public owner;
function owned() public {
owner = msg.sender;
}
function set( string memory _data) public {
data = ...
0
votes
0answers
32 views
How to handle estimate gas cost error?
I am programming a button for a transaction which shall only appear if the transaction is possible. Therefore, I am using the following code
contract.methods.function(parameters)
.estimateGas({...},...
0
votes
3answers
58 views
Solidity Compatibility Configuration
I am a cyber security analyst who is new to ethereum and working on a project to study crypto security. It's a series of 22 vulnerable smart contracts that you're supposed to exploit. For anyone who ...
0
votes
0answers
43 views
Accidentally sent REN (ETH token) to my ETH contract address using my Ledger Nano S. Can someone help please? [duplicate]
I sent REN (ETH token) to my ETH contract address by accident while using my ledger nano s. Can someone help me understand what's happened to the tokens and if I can retrieve my REN token from my ETH ...
1
vote
0answers
25 views
MetaMask returns different error - not longer working
I am calling the MetaMask promt successfully with this:
ethereum.enable().then(response => {
console.log("ABC");
}).catch(error => {
console.log("XYZ")
});
However, when I disagree ...
0
votes
0answers
29 views
Error while deploying smart contract ,BadFunctionCallOutput
The log i am having while deploying a smart contract:
-------- load log data --------
user.address = 0x2154f8B602c470ae7F10f242DCC88Ae6221bb263
contract.address = ...
0
votes
0answers
58 views
Cannot read property length of undefined in Remix / tried to increase gas not working
My contract was working just fine, but I don't know what happened, now when I try to interact with a new instance of my contract from Remix I get this error 'cannot read property "length" of undefined'...
0
votes
2answers
320 views
Why am I Getting: Transaction Error. Exception thrown in contract code in Real?
WE Had Create A Dapp Like POWHD, we Already Deployed It And Some Of Transactions Are Already Done well. But After Some Time The issue I'm encountering with my real contract (Dapp) is that trying to ...
0
votes
1answer
35 views
Why does updating an external variable results in an error?
I'm trying to update a variable within an external contract.
My 2 contracts are as follow:
pragma solidity ^0.4.25;
contract MainContract {
string public variable1;
function setVariable1(string ...
0
votes
0answers
96 views
- does not trigger a Solidity `revert` statement
My Smart contact was running smoothly .I was smoothly executing
the function successfully .
MinterFunction(address account, uint256 value) public {
value = value.mul(1 finney);
require(...
1
vote
2answers
25 views
Simple contract throws for no apparent reason
the thing is that i have a very simple contract code that I wrote as a kind of "Hello World!", but it doesn't seem to work properly, and I can't see any reason why it wouldn't work.
The code I'm ...
0
votes
3answers
96 views
REMIX:This contract does not implement all functions and thus cannot be created
What should I do?
pragma solidity ^0.4.21;
contract ScoreInterface {
function hit() public;
function score() public view returns (uint);
}
This contract does not implement all ...
2
votes
1answer
133 views
Metamask Error messages shows only revert
I have a little problem with the error messages I receive from MetaMask. In my dApp I have a modifiers which should throw an error with an error message. However, in MetaMask I only receive the RPC ...
4
votes
2answers
736 views
Solidity! Invalid implicit conversion from string memory to bytes memory requested
pragma solidity ^0.5
contract ProofOfExistence {
// ... some code here
function proofFor(string memory document) public view returns(bytes32) {
return sha256(document);
}
//...
2
votes
1answer
76 views
How to handle require/revert/assert errors properly
I'm trying to find an easy pattern to revert/rollback a write transaction.
The first idea was to log a GenericErrorEvent but then I noticed that it will never be emited if any require/revert/assert ...
1
vote
2answers
233 views
Calling an address array in web3 returns an error that the method needs arguments
I'm declaring a public address array in my contract, but when I call it, I get an error saying it's expecting an argument. Can someone shine a light on what is happening here?
Contract.sol
uint ...
1
vote
2answers
34 views
Why is solidity throwing “Note: The constructor should be payable if you send value. ”, when clearly the issue is elsewhere?
I'm writing a contract on Remix that is able to deploy and track child contracts.
Here are the 2 contracts:
pragma solidity ^0.5.0;
Contract Factory
contract ContractFactory{
ChildContract[] ...
